<!DOCTYPE html>
<html lang="en" fonsize=16px>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>
        <p> 1000px -> 500px
            <a href="">  50% 500px -> 250px
                <span></span> 20% 50px
            </a>
        </p>
    </div>
</body>
</html>